170 lines
4.1 KiB
Plaintext
170 lines
4.1 KiB
Plaintext
# Copyright: Public domain.
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# Filename: LAMBERT_AIMPOINT_GUIDANCE.agc
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# Purpose: Part of the source code for Luminary 1A build 099.
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# It is part of the source code for the Lunar Module's (LM)
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# Apollo Guidance Computer (AGC), for Apollo 11.
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# Assembler: yaYUL
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# Contact: Ron Burkey <info@sandroid.org>.
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# Website: www.ibiblio.org/apollo.
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# Pages: 651-653
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# Mod history: 2009-05-18 RSB Transcribed from Luminary 099
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# page images.
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# 2009-06-05 RSB Corrected 4 typos.
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# 2009-06-07 RSB Fixed a typo.
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#
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# This source code has been transcribed or otherwise adapted from
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# digitized images of a hardcopy from the MIT Museum. The digitization
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# was performed by Paul Fjeld, and arranged for by Deborah Douglas of
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# the Museum. Many thanks to both. The images (with suitable reduction
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# in storage size and consequent reduction in image quality as well) are
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# available online at www.ibiblio.org/apollo. If for some reason you
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# find that the images are illegible, contact me at info@sandroid.org
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# about getting access to the (much) higher-quality images which Paul
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# actually created.
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#
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# Notations on the hardcopy document read, in part:
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#
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# Assemble revision 001 of AGC program LMY99 by NASA 2021112-61
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# 16:27 JULY 14, 1969
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# Page 651
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# GENERAL LAMBERT AIMPOINT GUIDANCE **
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# WRITTEN BY RAMA M AIYAWAR
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# PROGRAM P-31 DESCRIPTION **
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#
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# 1. TO ACCEPT TARGETING PARAMETERS OBTAINED FROM A SOURCE EXTERNAL
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# TO THE LEM AND COMPUTE THERE FROM THE REQUIRED-VELOCITY AND
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# OTHER INITIAL CONDITIONS REQUIRED BY LM FOR DESIRED MANEUVER.
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# THE TARGETING PARAMETERS ARE TIG (TIME OF IGNITION), TARGET
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# VECTOR (RTARG), AND THE TIME FROM TIG UNTIL THE TARGET IS
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# REACHED (DELLT4), DESIRED TIME OF FLIGHT FROM RINIT TO RTARG.
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# ASSUMPTIONS **
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#
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# 1. THE TARGET PARAMETERS MAY HAVE BEEN LOADED PRIOR TO THE
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# EXECUTION OF THIS PROGRAM.
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# 2. THIS PROGRAM IS APPLICABLE IN EITHER EARTH OR LUNAR ORBIT.
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# 3. THIS PROGRAM IS DESIGNED FOR ONE-MAN OPERATION, AND SHOULD
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# BE SELECTED BY THE ASTRONAUT BY DSKY ENTRY V37 E31.
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# SUBROUTINES USED **
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#
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# MANUPARM, TTG/N35, R02BOTH, MIDGIM, DISPMGA, FLAGDOWN, BANKCALL,
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# GOTOPOOH, ENDOFJOB, PHASCHNG, GOFLASHR, GOFLASH.
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#
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# MANUPARM CALCULATES APOGEE, PERIGEE ALTITUDES AND DELTAV DESIRED
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# FOR THE MANEUVER.
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#
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# TTG/N35 CLOCKTASK - UPDATES CLOCK.
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#
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# MIDGIM CALCULATES MIDDLE GIMBAL ANGLE FOR DISPLAY.
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#
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# R02BOTH IMU - STATUS CHECK ROUTINE.
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# DISPLAYS USED IN P-31LM **
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#
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# V06N33 DISPLAY SOTRED TIG (IN HRS. MINS. SECS.)
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# V06N42 DISPLAY APOGEE, PERIGEE, DELTAV.
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# V16N35 DISPLAY TIME FROM TIG.
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# V06N45 TIME FROM IGNITION AND MIDDLE GIMBAL ANGLE.
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# ERASABLE INITIALIZATION REQUIRED **
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#
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# TIG TIME OF IGNITION DP (B+28) CS.
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#
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# DELLT4 DESIRED TIME OF FLIGHT DP (B+28) CS
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# FROM RINIT TO RTARG.
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#
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# RTARG RADIUS VECTOR OF TARGET POSITION VECTOR
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# RADIUS VECTOR SCALED TO (B+29)METERS IF EARTH ORBIT
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# Page 652
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# RADIUS VECTOR SCALED TO (B+27)METERS IF MOON ORBIT
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# OUTPUT **
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#
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# HAPO APOGEE ALTITUDE
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# HPER PERIGEE ALTITUDE
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# VGDISP MAG. OF DELTAV FOR DISPLAY, SCALING B+7 M/CS EARTH
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# MAG. OF DELTAV FOR DISPLAY, SCALING B+5 M/CS MOON
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# MIDGIM MIDDLE GIMBAL ANGLE
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# XDELVFLG RESETS XDELVFLG FOR LAMBERT VG COMPUTATIONS
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# ALARMS OR ABORTS NONE **
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# RESTARTS ARE VIA GROUP 4 **
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SETLOC GLM
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BANK
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EBANK= SUBEXIT
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COUNT* $$/P31
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P31 TC P20FLGON
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CAF V06N33 # T16
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TC VNP00H
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TC INTPRET
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CLEAR DLOAD
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UPDATFLG
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TIG
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STCALL TDEC1 # INTEGRATE STATE VECTORS TO TIG
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LEMPREC
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VLOAD SETPD
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RATT
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0D
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STORE RTIG
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STOVL RINIT
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VATT
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STORE VTIG
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STODL VINIT
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P30ZERO
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PUSH PDDL # E4 AND NUMIT = 0
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DELLT4
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DAD SXA,1
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TIG
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RTX1
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STORE TPASS4
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SXA,2 CALL
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RTX2
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INITVEL
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VLOAD PUSH
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# Page 653
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DELVEET3
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STORE DELVSIN
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ABVAL CLEAR
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XDELVFLG
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STCALL VGDISP
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GET.LVC
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VLOAD PDVL
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RTIG
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VIPRIME
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CALL
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PERIAPO1
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CALL
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SHIFTR1
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CALL # LIMIT DISPLAY TO 9999.9 N. MI.
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MAXCHK
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STODL HPER
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4D
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CALL
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SHIFTR1
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CALL # LIMIT DISPLAY TO 9999.9 N. MI.
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MAXCHK
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STORE HAPO
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EXIT
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CAF V06N81 # DELVLVC
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TC VNP00H
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CAF V06N42 # HAPO, HPER, VGDISP
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TC VNP00H
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TC INTPRET
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REVN1645 SET CALL # TRKMKCNT, TTOGO, +MGA
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FINALFLG
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VN1645
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GOTO
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REVN1645
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# *** END OF LEMP30S .103 ***
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